OPC Cement

Dalmia PSC Cement

 

High Quality Slag Cement

 

 

High Quality Slag Cement

Dalmia slag cement satisfies almost all the requirements of high grade OPC without sacrificing on strength and setting time parameters. In addition, it provides certain other additional benefits towards durability of structures. It is an interground mixture of high quality Portland cement clinker and a proportioned quantity of high quality granulated blast furnace slag. Imported high quality gypsum is also added to regulate setting time.

High Quality Clinker

High quality Clinker in Dalmia PSC is produced in a modern sophisticated plant with latest quality control and quality assurance facilities to have proper and balanced chemical composition i.e., optimum level of C3S & C2S, low levels of C3A, MgO, freelime, SO3 and chloride.

High Quality Slag

Good & highly consistent quality Slag in Dalmia cement is sourced from the most trusted steel maker of India "Sail" .Slag is a byproduct in the manufacture of hot metal (Iron) during smelting (a pyro-metallurgical process) in the blast furnace. The molten slag when properly granulated by rapid quenching, becomes a very useful additive to cement and called granulated blast furnace slag. Granulated Slag contains similar oxide compositions that of cement but proportions are varying. The slag compositions should be transformed to glassy structure to have proper hydraulicity. Slag has chemical composition that is closer to cement chemical composition.

Manufacturing of Dalmia PSC

High Quality Dalmia Slag Cement is manufactured by inter-grinding of high quality clinker with high quality slag and gypsum in predetermined proportions to achieve desired result. It can also be a separate grinding and mixing depending upon specific requirements.

Optimum combination of five important elements lead to the production of high quality Dalmia slag cement.

  1. High Quality Clinker sourced from integrated cement plant, a prime requirement.
  2. Rigorous selection of slag with proper chemical composition and hydraulicity, essential to guaranteed quality, single source for consistent quality slag from "Sail"
  3. Grinding the cement to optimum level (neither high nor low) of fineness depending upon the quality of clinker, slag and its reactivity.
  4. Dosage of slag is proportioned to ensure desired level of strength parameter. (Though BIS permits use of 35-70% of slag in PSC).
  5. Controlled and closely monitored intergrinding of clinker, slag and properly proportioned gypsum , essential to achieve predetermined levels of quality parameters.

DALMIA PSC-The Final Product

The final product obtained by using high quality input materials along with rigorous and continuous monitoring of quality assurance system will have setting time (initial and final) equal to that of OPC and also match in 3, 7 & 28 days compressive strength. In fact, the 28 days strength of high quality Dalmia Portland Slag Cement is normally in E-grade (Avg. 550 Kgs/cm2) , one of the highest possible grades as per IS-10262-1982 for cements tested as per IS-4031-1968.

Superiority of High Quality Dalmia Slag Cement

  • Higher long term strength due to secondary/reinforcing gel formation during hydration.
  • Denser gel structure results in low permeability, resulting in higher protection against chemical attacks and weathering effects.
  • Other superior attributes are optimally higher fineness and lower heat of hydration which leads to better cohesion, compactability and lesser thermal expansion and cracks.
  • Inherent characteristics of low reactivity with chlorides, sulphates and reactive aggregates.
  • High ultimate strength results in saving of cement 'consumption through scientific mix design.

Application of High Quality Dalmia Slag Cement ?

  • High quality Dalmia slag cement can be used in all types of construction works i.e., Plain & Reinforced Concrete and Masonry works with advantage.
  • Its superior features and its inherent characteristics make Dalmia PSC the ideal choice for safe and durable construction in hot and humid coastal areas.
  • For concrete structures in polluted sub-soil or Marine environments, Dalmia PSC offers greater protection compared to Ordinary Portland Cement.
  • For all mass concreting jobs, it should be always specified and preferred over OPC due to its low heat of hydration.

Typical Applications for Dalmia Slag Cement

  • Almost all applications where OPC is used.
  • Mass concrete structures like dams, barrages etc.
  • Structures in sulphate soils.
  • Industrial structures subjected to chemical fumes.
  • Water retaining structures like underground and overhead water reservoirs, retaining walls for river training and flood control works.
  • Bridge abutments.

It can be safely concluded from the above details that Dalmia Portland Slag Cement is beneficial in many ways to tackle the environmental effect to contribute higher durability of structures. In the increasing level of pollution in modern days due to large scale industrialization, it is always advantageous to use blended cement like PSC .Dalmia PSC due to its inherent characteristics protect the structure against environmental attacks through higher density of concrete and lower reactivity with chemicals and fumes.

Physical & Chemical characterstics of Dalmia Portland Slag Cement (As per BIS-455-1989)

Physical Requirements BIS Requirements Dalmia PSC
Fineness 225 m2 / Kg (Minimum) >380 m2 / Kg
Compressive Strength    
3 D 16 Mpa (Minimum) >25 Mpa
7 D 22 Mpa (Minimum) >35 Mpa
28 D 33 Mpa (Minimum) >55 Mpa
Soundness    
Le-Chat expn 10 mm (Maximum) <1
Autoclave expn 0.8% (Maximum) <0.02
Setting Time (in Minutes)    
Initial 30.00 (Minimum) 180-220 Min
Final 600.00 (Maximum) 220-250 Min
Chemical Requirements    
MgO 8.0% (Maximum) 5.0-7.0%
SO3 3.0% (Maximum) 1.8-2.2%
S 1.5% (Maximum) 0.2-0.4%
LOI 5.0% (Maximum) 0.5-1.5%
IR 4.0% (Maximum) 1.0-2.0 %

 

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